What is a word? Are names (of people, places, gods, buildings, etc.) words? In antiquity spelling was not standardised, and gender, suffixation, and inflectional categories could also be variable: what kind of divergences indicate that a variant form found in an ancient source should be considered a distinct word from other related forms? Although such questions cannot be definitively answered, the approach taken in this book is clarified and justified by detailed comparison with other lexica.